from re import I


def fun_checkout(money):


    money_old = sum(money)
    money_new = money_old
    if 500<=money_old<1000:
        money_new ='{:.2f}'.format(money_old *0.9)
    elif 1000 <=money_old<=2000:
        money_new ='{:.2f}'.format(money_old *0.8)
    elif 1000 <=money_old<=3000:
        money_new ='{:.2f}'.format(money_old *0.7)
    elif 1000 <=money_old>=3000:
        money_new ='{:.2f}'.format(money_old *0.6)
        return money_old,money_new

    print("\n开始结算......\n")
    list_money =[]
    while True:
        #
        inmoney =float(input("输入是商品金额："))
        if int(inmoney)==0:
            break
        else:
            list_money.append(inmoney)
        money =fun_checkout(list_money)
        print("合计金额：",money[0],"应付金额：",money[1])
   